(Un)original Prusa Drybox sealing Window Frames

To use the (Un)original Prusa Drybox as “dry” box it should be as airtight as possible. In particular, the window edges on the beams C1 and C2 lack the support of a center  screw to clamp the window to the frame.

I designed this model as window frames which will be used from the outside to clamp the windows to the drybox beams. All sections are designed with a curved profile, so when the outer screws are tightened they will apply pressure to the window glass also at the center of the framed sections.

A nice side effect is that you don't need to fear the windows cracking by over-tightening the screws. The frames will prevent that because of their large contact area with the window glass.

I also created addon parts for the drybox to pull the door flush: (Un)original Prusa Drybox Magnetic Door Retainer

Changelog:

• 2025-04-18: Added reference to (Un)original Prusa Drybox Magnetic Door Retainer
• 2025-03-31: Uploaded first public R4 revision of frame set.

Additional Hardware you need:

• Replace all M3x8 screws used for the windows with M3x14 screws.
• EPDM 10mm x 1mm sealing tape, ~7m, to be safe get 10m.

Printing

• Material: I used PETG, not sure if PLA would work because that usually creeps over time.
• Nozzle: 0.4mm
• Layer Height: 0.2mm
• Perimeters: 4
• Top and Bottom layers: 5
• Infill: 15% Gyroid
• Supports: For support enforcers only
• Orientation: 
  • Print all parts on their side so that the curves can be printed perfectly.
  • Some parts have rounded corners which should be pointed upwards.
  • All parts have holes designed in a teardrop shape where the tips should point away from the heatbed.
  • Only part A and Am need painted on supports on each end.
  • Part K is meant to be printed upright
  • Have a look at the two example slicer screenshots.
  • Alternatively use the .3mf file and your print profiles.

Quantities needed

• Top
  • 2x E, 2x F, 2x Fm, 2x G
• Rear
  • 2x F, 2x Fm, 2x G, 2x H
• Bottom
  • F, Fm, G, 2x I, 2x J, K
• Side Left
  • Am, Bm, C, Dm
• Side Right
  • A, B, C, D

Installation

To seal up the drybox, I attached single-sided EPDM sealant tape, 10mm x 1mm, to all drybox beam edges where the windows are sitting.

Afterwards I installed the windows with the frames as indicated by the following picture.

Especially on parts D, Dm, 2x I, do not overtighten the screws you get a bit more pressure in the center sections when you don't put too much pressure on the ends of the window bars.