This is a fast printing surgical mask strap based on the original design found here. One of these prints in 4 minutes. Eight print in 27 minutes.

The changes are mostly:

• constant wall thickness of 3.3 mm
• one extra hook on both sides (strap is 24 mm longer)
• Thickness of 1 mm to print faster

Print instructions

This design is made to have a constant wall thickness of 3.3 mm everywhere. It only needs perimeters, no infill, no solid layers on top and bottom!

These are the relevant settings:

These settings should lead to 4 perimeters that exactly fill the width of 3.3 mm.

Your slicing result should look like in the picture below:

Look into this README for additional details on how to print this very fast.

Printing the included gcode / 3mf

The included gcode and 3mf files are tuned for very high speed printing! If your printer can't manage the speed, lower the Max volumetric speed in the Filament Settings. This will slow down the overall print. Do not touch the print speeds in the Print Settings tab! The speed for the first layer is quite high, if you have problems with first layer adhesion, lower the First layer speed in the Print Settings.

Quality Control

Make sure your parts are strong enough! Take a look at the pictures and check if your part bends as shown.

Also make sure that the perimeters do not detach from each other! If they do, increase the Extrusion multiplier. I found 1.25 to be working nicely when printing really fast.