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Printer otter

Jana-Marie·otter-printer

Printer otter PCB layout, top view — open source STM32 board by Jana-Marie

About the Printer otter PCB

Printer otter is an open source STM32 PCB design by Jana-Marie, published on GitHub. It is a 2-layer board measuring 36 × 32 mm, with 48 components from 23 distinct parts.

Its main chip is the STM32F072C8Ux, from the STM32 family. Other key parts include the MT3608, AP2204R-3.3, USBLC6-4SC6, L78L09_SOT89 and 4504. By type, the board carries 14 capacitors, 13 resistors, 7 ICs, 5 connectors, 4 transistors and 3 diodes.

From the project

It prints Otter!

Controllerboard and FW for HP 302 cartridges

Printer otter, from the project README
From the project README

Main components on the Printer otter

MT3608STM32F072C8UxAP2204R-3.3USBLC6-4SC6L78L09_SOT894504

Printer otter bill of materials (BOM)

48 components, 23 distinct parts.

QtyPartRefs
1
MT3608
U1
1
STM32F072C8Ux
U2
1
AP2204R-3.3
U3
1
USBLC6-4SC6
U4
1
L78L09_SOT89
U5
2
4504
U6, U7
2
Q_NMOS_GSD
Q1, Q3
2
Q_PMOS_GSD
Q2, Q4
1
USB
J1
1
Printer
J2
1
Encoder
J4
1
UART
J5
1
Analog
J6
1
Down
SW1
1
Power
D1
1
D_Schottky
D2
1
Status
D4
1
15µ
L1
5
1uF
C1, C2, C7, C11, C19
9
0.1μF
C4, C5, C6, C18, C20, C21, C22, C23 +1
Show 3 more
QtyPartRefs
2
5k1
R1, R3
10
2k
R2, R5, R6, R7, R8, R9, R10, R11 +2
1
51k
R4

Printer otter design files

The KiCad project lives in the Jana-Marie/otter-printer repository on GitHub; these links point at the commit this page was built from.

Printer otter: common questions

What microcontroller does the Printer otter use?

The Printer otter is built around the STM32F072C8Ux, from the STM32 family.

How big is the Printer otter PCB?

The Printer otter measures 36 × 32 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Printer otter?

48 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the Printer otter design files?

From the Jana-Marie/otter-printer repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Printer otter design in my own project?

The repository has no license, so all rights stay with Jana-Marie. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Printer otter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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