A Safer Object Permanence Box

I wasn't happy with the object permanence boxes available, so created my own improved version.

Improvements include:

• Sloped floor
• No sharp edges
• No sharp corners
• No supports needed for the box
• STL exports were terribly coarse, no harm in using more elements people!
• This ended up being an igloo instead of a box, but does it matter? Its safe(er)! :D

By my unofficial reckoning, this ball satisfies the non-chocking hazard requirements as listed in 16 C.F.R. § 1501.4 so long as the ball is rigid enough to maintain its shape. Hence, I recommend printing a ball instead of using a 'ping pong ball' https://www.ecfr.gov/current/title-16/chapter-II/subchapter-C/part-1501/section-1501.4

40mm (standard ping pong ball) = 1.57in > 1.25in.

Cheers!

Print Settings

Printer Brand:

Prusa

Printer: 

I3 MK3S

Brim:

Yes, 8mm

Supports: 

No

Resolution:

0.2mm height, 0.4mm nozzle

Infill: 

10%, gyroid, 3 walls

Filament: 3D Printing Canada PETG Grey, Yellow
128 grams, 9.5h

How I Designed This

Designed in Onshape.

Designed with 3D printing in mind, the main body requires no supports (overhangs are <30 deg). Main body will benefit from a 8mm brim to avoid warping due to the generous fillets used.

The ping pong ball needs support material for >40 deg (set in slicer)