We've been running foundationless frames on all our hives. It's less work and may have some health benefits for the bees. To do this though we've had to retrofit comb guides to our regular bought frames. We don't make our own equipment. Our hive supplier is cheap enough and we're small enough that it wouldn't make sense to start making them, so we have to modify them to our needs.
We started by using tongue depressors to press into the groove carved on the inside of the top bar of the frame that would normally fit the wax sheet. We found that two of them fit snugly into the frames and initially just pressed them in by hand and started using them. What we found was that even after the bees had put propolis on the depressors they would still sometimes fall out of the frame, probably once the hive got hot and the wood expanded. We had a hive lose a full comb probably as a combination of wood expansion and the comb's weight. Our method for these is now to put in a small amount of regular wood glue into the groove and then press the tongue depressors in. This seems to work fine and we haven't had one fail yet.
Our next issue was that sometimes the bees would actually build comb on both sides of the tongue depressors, so two combs to a frame, instead of using it as a guide. We had this happen with a new swarm. Once they get into that rhythm it's hard to break them off of it as they'll base the location of the next comb on the distance from the previous one, again ignoring the guide on the frame. We've recently tried a different approach which was to glue and nail a wedge to the full length of the frame. We had a woodshop take a 2cm by 2cm section length of pine wood and cut it in half lengthwise between opposite corners. This gave us the triangular section wedge to glue onto the frame. We cut it into several pieces with the length of the internal frame width and glued it on with wood glue and then nailed it in. The nailing was the hardest part, and a nail or staple gun might be ideal for this. So far we've only done a 10 frame box to test this in one of this year's swarm boxes.
The end result are two types of foundationless frame that we use in our swarm traps.
When the bees take the hint and follow the guide the end result is nicely drawn pristine white wax.