Hello, I have had a lot of people ask me to do a cake, but would need RKT support/ filler... Im not sure what to charge for this, would I bas eit on the cost of the RK + Marshmallow + time, or would I base it more towards a cake serving per slice?  I hope someone can help me out a bit, THANK YOU!

AI don't understand. They want to use rtk as a cake filling? Or there is a design that you need to use rkt as a structure? If the later, don't forget to include the additional cost of materials (fondant or whatever you're using) to cover the rkt and time to make whatever the completed element is (not just the time to make the rkt).

Sorry, not filling within the cake, but as a cake it's self ( multiple cakes but one is RKT ) I would include in the price my time to make and decorate it, ,but just wanted to see what other people charged for a RKT cake...

yes, would you price it the same as a cake, or because it has less ingredients would it be less?

I would not even combine the two.   If you need more tiers...I would use a dummy.  I'm confused as to why the two are being integrated into one design....??? That's just me...I think it is odd. 

ok, so saying you use a dummy...what would you charge for that?

The same as the tier it is replacing.  I have to buy it, ice it, fondant it and decorate it. 

If you are doing an RCT tier and decorating it the same as the "real" tiers I'd charge the same as a cake tier.

@ ddaigle I can see someone ordering a RCT tier. My son-in-law would chow into the RCT tier and leave the cake. I made him a cakefor his birthday last year that looked like a box of golf balls. The golf balls were RCT, and that's all he ate while the rest of the family ate the "box" they cme in which was dark chocolate with coffee frosting. A week later at Christmas dinner he ate the RCT Christmas ornaments off one of the cakes and never touched the cake itself (again the box they came in).

Cakeyouverymuch...your scenario of  using RCT in the design makes sense.   I've even seen a 3 tier RCT groom's cakes.    I just can't imagine disassembling the entire wedding cake to get to the RCT tier.   Just my thoughts...but I would not do it.    The OP is referring to use is as "support".    I would use a dummy for support and never mix a RCT in with the rest.   My opinion.