2 layers54 × 60 mm
2 layers27 × 60 mm
OpenFMS
aasmr/openFMSOpen-source filament presence and motion sensor for Klipper 3D printers – includes MCU firmware, PCB design, and 3D printable parts.
- Size
- 27 × 60 mm
- Copper layers
- 2
- Thickness
- 1.5 mm
- Parts
- 41
- Nets
- 28
- Pads
- 119
- Tracks, vias
- 82, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 8 Jun 2026
- Updated
- 3 Jul 2026
Overview
OpenFMS is an open-source printed circuit board by aasmr, from the aasmr/openFMS repository on GitHub, published under the MIT licence. It is a 2-layer board of 27 × 60 mm with 41 parts on 28 nets, routed with 82 tracks and 0 vias.
It is built around the BSS138L, AP2112K-3.3 and ITR9608-F. Its parts include 13 resistors, 9 capacitors, 1 IC and 1 crystal. It belongs with the STM32 boards of this library.
Main components
3
BSS138L
SOT-23-55℃~+150℃ 1 N-channel 1.5Ω@10V 1V 2.2pF 25pF 400mA 417mW 60V 650pC@4.5V 9.7pF N-Channel SOT-23 MOSFETs ROHSElecSuperMOSFETs
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
ITR9608-F
DIP-4-25℃~+85℃ 1.2V 15us 15us 20mA 5mm 940nm DIP-4 Photointerrupters - Slot Type - Transistor Output ROHSEverlight ElectronicsPhotointerrupters - Slot Type - Transistor Output
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10k | Resistor_SMD:R_0603_1608Metric | R7, R8, R9, R10, R12, R13, R14, R15, R16, R17 |
| 4 | BSS138L | Package_TO_SOT_SMD_AKL:SOT-23 | VT3, VT4, VT5, VT6 |
| 3 | 1 uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C9 |
| 3 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2, JP3 |
| 2 | 0.1 uF | Capacitor_SMD:C_0603_1608Metric | C4, C5 |
| 2 | 18 pF | Capacitor_SMD:C_0603_1608Metric | C3, C7 |
| 2 | 2k | Resistor_SMD:R_0603_1608Metric | R18, R19 |
| 2 | Conn_01x04 | Connector_JST:JST_EH_B4B-EH-A_1x04_P2.50mm_Vertical | XP1, XP2 |
| 1 | 10 nF | Capacitor_SMD:C_0603_1608Metric | C8 |
| 1 | 110 | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 4.7 uF | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 8 MHz | Crystal_AKL:Crystal_SMD_3225-4Pin_3.2x2.5mm | X1 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | DA1 |
| 1 | AS5600 | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | DD2 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | XP3 |
| 1 | ITR9608-F | OptoDevice:Everlight_ITR9608-F | V1 |
| 1 | STM32F030F4Px | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
The 37 most common of 41 parts.
Questions
How big is the OpenFMS PCB?
It measures 27 × 60 mm and has 2 copper layers, 1.5 mm thick.
What parts does the OpenFMS use?
41 parts, built around the BSS138L, AP2112K-3.3 and ITR9608-F. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the OpenFMS KiCad files?
From the aasmr/openFMS repository on GitHub, at the commit this page was made from: the board is Hardware/PCB/Source/openFMS.kicad_pcb and its schematic Hardware/PCB/Source/openFMS.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpenFMS design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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