BTT Pi 和 TFT35 SPI 扩展适用于 Ender 3

BTT Pi and TFT35 spi extension for Ender 3

2024-03-27 21:27:51

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Summary

I designed A Case to house your BigTreeTech Pi while being connected to an 2.5 inch SSD drive. It also features a Bezel that houses the BTT TFT35 spi for Klipperscreen which you can connect directly to the BTT Pi. The model is designed in such a way that you can print it on any 235x235 printer like the Ender3. (The Bezel is designed out of two pieces)

The Bezel hides the USB Cable that connects your printers mainboard to the Pi so no need to replace the housing of your mainboard for that. (make sure to use a usb cable that doesn't have a "long" USB connector on the mainboard side otherwise it will not fit under the Bezel or you could damage your USB connector on the mainboard, the Biqu stock micro USB cable doesn't fit for instance )

The Case Cover has a Fan duct that can accommodate a 40x40 fan to cool your BTT Pi. When using a standard 5v fan it can be directly connected to BTT Pi's dedicated Fan connector and be controlled trough a temperature Fan in Klipper.
Make sure to position your heatsink maximized to the front (almost against the Ethernet and USB connectors) to make sure it will not run into the Fan.

The Bezel also features a slot that can house a 10mm wide LED strip over the full length of the Bezel. When used the LED's will shine trough the Bezel, a neat way to add LED status indication to your printer.

I did not test this but I presume that a Raspberry Pi 3 should also fit since it has the same screw hole placement as the BTT Pi. Other Raspberry versions should also fit but will need some small modifications to the "Pi to SSD Mount". Using a Raspberry instead of the BTT Pi would also mean that you need to find a way to connect the TFT35 spi to it since you wouldn't have the dedicated connector for it like the BTT Pi has. The same goes for the connection of the Fan.

Make sure to connect the Left and Right Bezel to each other using two standard bolts and nuts while aligning the front of the Bezel parts (the left parts falls 1mm a short on the back, this is to take the 1mm thick sheet metal of the mainboard housing into account).
When installing make sure to start with the case using a T-Screw in the back and only the upper right screw on the front, followed by putting in your SSD and BTT Pi. You can run your cables trough the hole on the back left of the Case and trough the front. After this place the cover and the Bezel. Make sure to put in the TFT35 spi as the last step in the process when the rest is already in place on your printer otherwise you will not be able to tighten the second screw on front right. You can do so by sliding it in from the bottom. The model accommodates holes for your screwdriver to be able to screw the TFT35 in place while the rest is already mounted. To be able to easily tighten the upper left screw of the TFT make sure to choose a serial-ATA to USB converter that is not to bulky. I found out the hard way since for me it was very fiddley to get the screw in. Later on I may revise the model replacing the upper screw holes with a slot that hooks in the screen while only remaining the lower two easy to access screw holes.

When you look closely to the pictures of my end result you will find out that the two hooks locking the SSD in to place are missing on the case. Also the "BTT Pi to SSD Mount" is not a complete clean fit. This is a result of not taking some margins into account when drawing the models. Please rest assure that I updated the models fixing these little error's but since I could easily work around them I decided to make the environmental friendly decision to not reprint those parts.

If you are going to use this model I would really like to read about your findings and see your end results, so please take the time to write down your findings and upload your pictures ;).
And if you really really really love the model you are free to buy me a beer trough Patreon if you want ;)

Print Settings

Printer brand:
Creality
Printer:
Ender 3
Rafts:
No
Supports:
Yes
Resolution:
0.2mm
Infill:
20%
Filament brand:
JAYO
Filament color:
White
Filament material:
PETG
Notes:
Nozzle temp: 235 °C
Bed temp: 75 °C
Support overhangs larger than 70 degrees

Use PETG for more strength
Use PLA for easier support removal

Post-Printing

Cover

I printed it in its final orientation (screwholes below) but I found it to be a pain to remove the support so maybe printing it upsidedown would be a better choice when also printing with PETG like me. (on the other hand, this wouldn't give you the same clean top finish)
When using PLA this shouldn't be a problem and I would opt for printing in the normal orientation since you would use way less support material.

Case

Just print it in it's final orientation resulting in only little support.

Bezel Right

Just print it in it's final orientation for the cleanest result. It will generate quite a lot of support but this would also be the case when choosing other orientations. Make sure to not print support for overhangs smaller than 70 degrees can help allot and prevents support generation for the part where the display is placed.
Again, wit PETG the support removal will take you some time but the end result will be worth it.

Bezel Left

Print it on its back, with the hollow side to the bed gives you the cleanest result.

BTT Pi to SSD Mount

Just print it in it's final orientation resulting in only little support.

How I Designed This

I used Fusion 360 to design it.
In fact it is my first project in Fusion 360 and I used it to improve my Design skills.
Before using Fusion 360 I mainly used 123D Design for my small personal 3D printing projects.
While liking 123D allot I found Fusion 360 to be better and having way less quirks.