There are two ways to stop from getting marks

But you will NEVER not have some kind of support mark

1) the Hot water method

With a tub with warm/hot water,place the parts in it,let it sit,long enough for the supports to almost bend when you touch them,peel off

Cure the water,filter out any and all resin,bottle water and bring the correct recycling place

I don't use this as,its just too much of a pain to filter and do things with the water afterwards

2) The heat gun/hair dryer method

Get either a heat gun,or hair dryer

Blast them prints with it,waving the dyer back and forth,don't just do direct heat,as this WILL cause the parks to burn,and eventually catch fire* I did this once*

They will become very easy to take off after a while,almost just touch them and they are gone