Compact and UPS-friendly 1x1 loaders. Works with train cargo wagons, circuits, filters, and modded belts from Bob's, Krastorio, FactorioExtended Plus, Space Exploration, and Ultimate Belts.
It would appear that the recipes for filter Miniloaders are still requiring previous tier filter Miniloaders, specifically when Bob's "belts require previous tiers" setting is false. Regular Miniloaders recipes work as expected.
I would have though that with the Bob's setting as false, that the filter Miniloaders would require filter inserters and undergrounds?