I had mold with both the home made paper pots and toilet paper pots.Although there are issues with plastics, I've had bad experiences with cardboard planters and mold in the past.
Now I use large yogurt or cottage cheese cartons to make pots. Eventually the plastic gets brittle, but I have some pots that are 3-4 years old. I've posted my how to a few times; I don't know if I've put it here, so I'll go ahead and post it again.
Collect this kind of container, with the lid.
Cut the bottom off.
This is your pot. Poke holes in the bottom (lid) for drainage.
Fill with soil, plant your seeds, grow a happy little plant. When it's time to set it out in the garden (after hardening off), dig the hole, take the lid off the bottom, and set the pot in the hole. The taper of the container will let you slide the pot up off the dirt and plant.
Wash, sterilize with a bit of bleach in the rinse, dry, and use again the next year.
	
 I only wish I had an outside greenhouse. Maybe someday.
 Last year I had great success with my plant starts, but this year it was pretty much a waste of time. I already mentioned that this year I purchased some inferior potting soil for the seed starts and I think that made all the difference. It was too coarse and bulky and had no fertilizers added to it.
 It makes no sense to be frugal on your potting mix purchase if you end up wasting those precious weeks, or months, on an inferior seed starting product that does not work. You can't get that time back.
 In my case, I was able to use some zip ties to reattach a ring back unto the leg where the weld had broken. Took me maybe only a minute or two per tomato cage repair with the zip ties. I buy my zip ties in economy packs for about 1 penny per zip tie. For a few pennies each, I fixed a couple of my larger (4 foot tall) broken tomato cages this way. Those cages cost about $8.00 at the store to replace, so I was very happy that the zip tie fix actually works for me.