Resin manufacturers advise a printing temperature for their products, which for most I've seen is around 24°c. There is no way I can or want heat my basement (where my printer is) to 24°c. So best way is to heat printing enclosure or a container with printer inside.

My choice is to heat only the printing enclosure (best cooling for electronic and UV screen). X3msnake created a small heater for that https://www.thingiverse.com/thing:3442165, I've discovered thanks to VogMan video https://www.youtube.com/watch?v=bQmmGj6gMdk

As I don't want to drill my printer cover, I've created this project to allow 5 mm diameter cable pass into Elegoo Mars 3 printing enclosure.

To create my model I've used printer's model, big thanks to Elegoo for sharing it https://github.com/elegooofficial/Mars3

I modelled it with Freecad, model source file included.

Two way to create it :

• Multi part model can be printed with printer having 200x200 mm bed.
• One part model will require a bigger print bed (issue in front zone, read bellow).

The pole holding the heater (equipped with magnets) is 2 mm thick bended steel sheet.

One part model's stl file was having many error. I corrected them with automatic tools with no full success. There is a unwanted small hole in the front zone. However it should perfectly work for the purpose of that project (I haven't printed it).

Edit : @LayeredChicke_539535  pointed me there is an issue with my wire cap not feeting part “Base - one part”.
I had uploaded a previous version of “Base - one part” part fo Elegoo Mars 3 with thiner Z pole than mine (same as Elegoo model in my CAD file).
There is now a v2 version that will fit well with the wire cap and with Elegoo Mars 3 having a big Z pole (same as mine, you can see on my pictures).

For multipart model you will need

12 x M3x8mm socket head screws

1 x M3x8mm flat head countersunk screw

13 x M3 heat insert 5mm (diameter) x 4mm (length)

For single part model you will need

4 x M3x8mm socket head screws

1 x M3x8mm flat head countersunk screw

5 x M3 heat insert 5mm (diameter) x 4mm (length)