Some basic ladders I put together. I've been able to print them consistently without, but it might be worth adding a small exterior brim if you have any adhesion issues. You can print whichever one fits your dimensional needs, if you don't want to do them all.

Dimensions from largest to small:

1 - 130mm L x 37mm W x 7mm D

2 - 115mm L x 34mm W x 6mm D

3 - 95mm L x 30mm W x 6mm D 

4 - 70mm L x 18mm W x 4mm D

5 - 51mm L x 13.5mm W x 3mm D