update nov 2023
those who are having trouble finding id size they use slicer measuring tool extenstion to scale the stl up or down as per there required pipe fittings i did same for mine my pvc pipe were salvage from old toy tent so they were 9mm i scale the model in slicer to fit the pipe perfectly for loose joint just ally small tape or shim it will fit well or just glue once every thing is set in place


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Did a scale down version test for my pipe fitting as shown in image

*update added soildworks file for modifing the joints ad per your need*

all internal dimention of stl are 20mm do a test print of one to check best fit for you pvc pipe as it diffrers from style and company

update instruction :

fig:1
8x : y way joint 8 for cube
4x : L join for door
1x : hinge ( note glue any one side of hinge as per you liking and feel

fig:2
same as fig:1 plus
4x : middle support joint (if you want to make a layer use)
3x : angle joint (if you are adding exhaust or light to corner triangle printer)

MAKER NOTE :

makers plese test and update me with whats needed and sned you makes also its on prinatble download from there i will be happy to see mods for filament holder led bars and such