Endev

This project centers around a dev board that monitors my printer using electronic and mechanical components.

Features:

• Form factor: fits inside the spool holder bracket
• Mounting: Magnets that align with the spool holder bracket
• Peripherals: Accelerometer (to detect intense vibration), Temp/humidity sensor (self explanatory), ESP-12F (for sending notifications over wifi), Configuration switches, status LED
• Filament movement detection: Checks if the filament is moving or not (e.g. filament runout, jam)
• LED strip attachment: so I can illuminate my printer

I built it as my printer is not known for its reliability, so by tracking common points of failure, I can hopefully stop the print before wasting too much filament.

CAD

The full project

(+ the spool bracket where my components will be attached)

Note:

• The bearing in the cad is not the one i'll be using (I'll be using a u-groove one)
• The renders aren't great but i'll improve them soon

3d printing step files and additional pictures are in the cad folder

PCB

Main board

It's not the best but hopefully it works

Led strip

Encoder

the simplest pcb ever

Credits

My project is based off of @karmanyaahm's amazing jam, it was an incredible resource to learn about creating a PCB.

BOM

Item	Description	Quantity or MOQ	Price (USD)	Comments	Link
3D printed parts	I'll print these myself	2	Free
Magnets		20	4.19		https://www.aliexpress.com/item/1005009483101110.html?spm=a2g0o.cart.0.0.128c38daDbmklF&mp=1&pdp_npi=5%40dis%21USD%21USD%208.38%21USD%200.99%21%21USD%200.99%21%21%21%40210318c317539163040365915e4760%2112000049241614461%21ct%21CA%212723362424%21%211%210
Threaded inserts	M2 for attaching PCB (M2xL4xOD3.2)	100	1		https://www.aliexpress.com/item/1005006838108683.html?spm=a2g0o.detail.0.0.512duR8VuR8Vrr&mp=1&pdp_npi=5%40dis%21USD%21USD%203.41%21USD%203.41%21%21USD%203.41%21%21%21%402103241117539191290706303e0683%2112000038467725086%21ct%21CA%212723362424%21%211%210
Screws	M2 x 0.4mm x 5mm for attaching PCBs	50	1.54		https://www.aliexpress.com/item/32810872544.html?spm=a2g0o.productlist.main.4.5b891e26tUgjLP&algo_pvid=1f686fdf-e83e-46d2-acba-cea3141f00dc&algo_exp_id=1f686fdf-e83e-46d2-acba-cea3141f00dc-3&pdp_ext_f=%7B%22order%22%3A%2216205%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%211.48%210.99%21%21%211.48%210.99%21%402103244817539191205775498e2f9f%2112000037536050510%21sea%21CA%212723362424%21ACX&curPageLogUid=X9UQl2y2Bj6A&utparam-url=scene%3Asearch%7Cquery_from%3A
Bearing	U groove 4x13x4mm	12	5.63		https://www.aliexpress.com/item/1005008374164487.html?spm=a2g0o.productlist.main.3.540c548frWOPoS&algo_pvid=e7eb187c-3715-4f4d-86d2-6c2aa45f01d4&algo_exp_id=e7eb187c-3715-4f4d-86d2-6c2aa45f01d4-2&pdp_ext_f=%7B%22order%22%3A%228%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%211.57%211.41%21%21%2111.24%2110.12%21%402101efeb17539194800916458e50a1%2112000044764627302%21sea%21CA%212723362424%21ACX&curPageLogUid=jzstNJ8wHypr&utparam-url=scene%3Asearch%7Cquery_from%3A#nav-review
Nut	M4 for securing the u groove + acts as a spacer	25	1.83	I geniunely only need 1 but don't own any	https://www.aliexpress.com/item/1005007593861199.html?spm=a2g0o.productlist.main.2.62af616dnb3xT0&aem_p4p_detail=20250730165314783684381599940002082931&algo_pvid=f8c104ff-09e8-4179-a7b6-f9ec4bdba51d&algo_exp_id=f8c104ff-09e8-4179-a7b6-f9ec4bdba51d-1&pdp_ext_f=%7B%22order%22%3A%2212155%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%211.68%210.99%21%21%2112.02%217.10%21%402101e9a217539195939612623eb9f2%2112000041426239341%21sea%21CA%212723362424%21ACX&curPageLogUid=tHTrrNlzocK6&utparam-url=scene%3Asearch%7Cquery_from%3A&search_p4p_id=20250730165314783684381599940002082931_1
Solder	0.6mm and 50g	1	7.47	I have a soldering iron but nothing else	https://www.aliexpress.com/item/1005008563576114.html?spm=a2g0o.cart.0.0.75a538daVmgtQw&mp=1&pdp_npi=5%40dis%21USD%21USD%207.47%21USD%207.47%21%21USD%207.47%21%21%21%402103247017539199222257238ee375%2112000045733462562%21ct%21CA%212723362424%21%211%210
Flux	30ml	1	5.53	I have a soldering iron but nothing else	https://www.aliexpress.com/item/1005006113424502.html?spm=a2g0o.productlist.main.1.69d91f2bDlbwSa&algo_pvid=b4d5fca4-f1b9-48cb-9127-33b5006cc8df&algo_exp_id=b4d5fca4-f1b9-48cb-9127-33b5006cc8df-0&pdp_ext_f=%7B%22order%22%3A%226348%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%2112.12%210.99%21%21%2186.49%217.05%21%402101c72a17539198472351756e97f8%2112000036314063931%21sea%21CA%212723362424%21ACX&curPageLogUid=pjg6NKMW8yr4&utparam-url=scene%3Asearch%7Cquery_from%3A
LED Strip		5	6	Regular PCB, I will hand solder this
Neopixel Mini	SK6812 mini	50	3.46	I need 18 but must order 50	https://www.aliexpress.com/item/32623583544.html?src=google&pdp_npi=4%40dis!CAD!2.79!2.79!!!!!%40!12000038353355761!ppc!!!&src=google&albch=shopping&acnt=631-313-3945&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&gclsrc=aw.ds&&albagn=888888&&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en32623583544&ds_e_product_merchant_id=107423131&ds_e_product_country=CA&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=19366866438&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gad_campaignid=17337458112&gclid=Cj0KCQjwhafEBhCcARIsAEGZEKKTgezmjLfd6-vxiWMkAzmBpETHMV6oXWkoH2YCoXS5DXzKvOlwE_EaAowGEALw_wcB
Resistor	330R for led strip	1	Free	Already have
Capacitor THT	100uF for led strip	50	3.47	moq = 50	https://www.aliexpress.com/item/1005002075527957.html?spm=a2g0o.productlist.main.6.c9e31aabWPIuSl&aem_p4p_detail=202507301701432974626457630600002074851&algo_pvid=98081cf6-03af-4a13-96bb-a4806a8f4a70&algo_exp_id=98081cf6-03af-4a13-96bb-a4806a8f4a70-5&pdp_ext_f=%7B%22order%22%3A%221470%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%213.81%210.99%21%21%213.81%210.99%21%402103205117539201031484034e6f50%2112000018654903109%21sea%21CA%212723362424%21ACX&curPageLogUid=7kJUGz1bNEBX&utparam-url=scene%3Asearch%7Cquery_from%3A&search_p4p_id=202507301701432974626457630600002074851_2
JST conn 3Pin	2.54 Pitch, right angle XH	50	3.46	for led strip and rotary encoder attachment that i'll solder myself cause its cheaper	https://www.aliexpress.us/item/33008489410.html?spm=a2g0o.cart.0.0.59e438dacPG6sZ&mp=1&pdp_npi=5%40dis%21USD%21USD%201.57%21USD%201.57%21%21USD%201.57%21%21%21%402103247017539157468407310ee33f%2167049563012%21ct%21US%212723362424%21%211%210&pdp_ext_f=%7B%22cart2PdpParams%22%3A%7B%22pdpBusinessMode%22%3A%22retail%22%7D%7D&gatewayAdapt=4itemAdapt
Encoder board		(five boards, 2 pcba)	$22.59	PCBA since buying the rotary encoder on its own would be $20+ due to shipping, the PCBA is only for the rotary encoder, the only other component is a JST conn which i'll solder
Main PCB (five boards, 2 pcba)	2 assembled pcbs COMPONENTS LISTED BELOW	(five boards, 2 pcba)	$59.21	Some parts are omitted for me to buy it myself and solder as it would be cheaper
1k5	0402	2	0.0012	C25867	https://jlcpcb.com/partdetail/26610-0402WGF1501TCE/C25867
ESP-12F	ESP-12F	2	4.431	C82891	https://jlcpcb.com/partdetail/AiThinker-ESP_12F_ESP8266MOD/C82891
ADG884xCP	Analog switch	2	5.649	C140435	https://jlcpcb.com/partdetail/AnalogDevices-ADG884BRMZ/C140435
4k7	0402	6	0.003	C25900	https://jlcpcb.com/partdetail/26643-0402WGF4701TCE/C25900
SHT31-DIS	Sensirion temp/humidity sensor	2	7.446	C80862	https://jlcpcb.com/partdetail/Sensirion-SHT31_DIS_B25kS/C80862
10k	0402	12	0.006	C25744	https://jlcpcb.com/partdetail/26487-0402WGF1002TCE/C25744
330R	0603	2	0.0022	C23138	https://jlcpcb.com/partdetail/23865-0603WAF3300T5E/C23138
16MHzC13738	OSC_X322516MLB4SI	2	0.1284	C13738	https://jlcpcb.com/partdetail/YXC_CrystalOscillators-X322516MLB4SI/C13738
100uF	1206	2	0.123	C15008	https://jlcpcb.com/partdetail/15681-CL31A107MQHNNNE/C15008
100nF	0603	4	0.0092	C14663	https://jlcpcb.com/partdetail/YAGEO-CC0603KRX7R9BB104/C14663
JS102011JCQN	SW_JS102011JCQN	2	2.106	C221659	https://jlcpcb.com/partdetail/CK-JS102011JCQN/C221659
Diode	D_SMA	4	0.1104	C8678	https://jlcpcb.com/partdetail/MDD_Microdiode_Semiconductor-SS34/C8678
YELLOW	0805	4	0.05	C2296	https://jlcpcb.com/partdetail/Hubei_KENTOElec-KT0805Y/C2296
GREEN	0805	4	0.0428	C2297	https://jlcpcb.com/partdetail/Hubei_KENTOElec-KT0805G/C2297
AO3401A	SOT23-3	2	0.1174	C15127	https://jlcpcb.com/partdetail/Alpha_OmegaSemicon-AO3401A/C15127
10uF	0805	6	0.0642	C15850	https://jlcpcb.com/partdetail/16532-CL21A106KAYNNNE/C15850
12pF	0402	4	0.004	C1547	https://jlcpcb.com/partdetail/1899-0402CG120J500NT/C1547
CH340N	SOP-8_3.9x4.9mm_P1.27mm	2	1.02	C2977777	https://jlcpcb.com/partdetail/WCH_Jiangsu_Qin_Heng-CH340N/C2977777
100nF	0402	12	0.0132	C1525	https://jlcpcb.com/partdetail/1877-CL05B104KO5NNNC/C1525
5k1	0402	4	0.002	C25905	https://jlcpcb.com/partdetail/26648-0402WGF5101TCE/C25905
ATmega328P-A	TQFP-32_7x7mm_P0.8mm	2	4.407	C14877	https://jlcpcb.com/partdetail/MicrochipTech-ATMEGA328PAU/C14877
TP4057	TSOT-23-6	6	0.2622	C725791	https://jlcpcb.com/partdetail/772194-TP4057/C725791
1uF	0603	6	0.0282	C15849	https://jlcpcb.com/partdetail/16531-CL10A105KB8NNNC/C15849
TS-1187A-B-A-B	SW_TS-1187A-B-A-B	2	0.0372	C318884	https://jlcpcb.com/partdetail/XKBConnection-TS_1187A_B_AB/C318884
10k	0603	2	0.0018	C25804	https://jlcpcb.com/partdetail/26547-0603WAF1002T5E/C25804
1k	0603	2	0.002	C21190	https://jlcpcb.com/partdetail/21904-0603WAF1001T5E/C21190
330R	0805	2	0.0036	C17630	https://jlcpcb.com/partdetail/18318-0805W8F3300T5E/C17630
XC6206P332MR	SOT-23-3	2	0.2046	C5446	https://jlcpcb.com/partdetail/TorexSemicon-XC6206P332MRG/C5446
JST conn 2Pin		50	1.65	cheaper than getting on jlc as it is an extended part	https://www.aliexpress.us/item/33008489410.html?spm=a2g0o.cart.0.0.59e438dacPG6sZ&mp=1&pdp_npi=5%40dis%21USD%21USD%201.57%21USD%201.57%21%21USD%201.57%21%21%21%402103247017539157468407310ee33f%2167049563012%21ct%21US%212723362424%21%211%210&pdp_ext_f=%7B%22cart2PdpParams%22%3A%7B%22pdpBusinessMode%22%3A%22retail%22%7D%7D&gatewayAdapt=4itemAdapt
LIS3DHTR	Accelerometer	5	2.07		https://www.aliexpress.com/item/1005006382321606.html?spm=a2g0o.productlist.main.2.8cc447cbAleP39&aem_p4p_detail=202507301559151645124693583640002013730&algo_pvid=77351851-b790-4232-9931-106025719c2d&algo_exp_id=77351851-b790-4232-9931-106025719c2d-1&pdp_ext_f=%7B%22order%22%3A%2214%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%212.07%212.07%21%21%2114.77%2114.77%21%402103244417539163558297165ed7e1%2112000036971142144%21sea%21CA%212723362424%21ACX&curPageLogUid=txmemcFKp5VV&utparam-url=scene%3Asearch%7Cquery_from%3A&search_p4p_id=202507301559151645124693583640002013730_1
SW-DIP-02		1	free	will get it myself
Aliexpress shipping			5.63
JLC shipping			$27.80
TOTAL: $148.82 (128.82 after JLC coupon)

Hi reviewer, I forgot to add this lipo battery before submitting, hope thats okay. It brings the total to $154.22 USD, bom.csv has been updated to include it