I recently printed "House Numbers by Glompie" thing 1403550. I upscaled the design to 200% in my slicer and it printed excellent. However, the fixings when upscaled were slightly too big and did not fit. So I have made my own fixings using Tinkercad. Hopefully of use to someone

Note this are designed to work with thing 1403550 when it is printed at 200% but print these at 100%