With this adapter I was able to use smaller spools such as 250g and 200g - Although you definitely want to add weight in the middle of the spool holder. I used fishing sinkers and it worked. Thank you to “thenoob” for his work on the original spool holder! I printed out multiple spool holders and found this one to be the best, in regards to holding the spool and using less filament. I also printed in PETG.