So to begin with, a lot of players have expressed interest in sharing items, renting them from others, borrowing bound gear, things of that sort and I've been reading them for a few years now and have something to say on the issue-
In Spiral Knights, gear is a HUGE investment and knowing what you're getting into without having to buy it would really help out.
So here's what I'm proposing-
1. Basil will offer a trial version of the recipes that he sells, free of charge.
2. The trial weapon/armor expires after a certain amount of time, say, 1 day.
3. The weapon/armor comes fully heated and cannot have unique variants. It comes marked with 'trial'.
4. Weapons and armor pieces can only be tried once, and only one may be tried at a time.
I actually really like this one. Similar to TF2.
Oh, but restrict the weapon trials to the appropriate rank and don't let them be used in anything but the training hall, Arcade, and maybe previously completed missions.