diff --git a/.gitignore b/.gitignore
index 80720af..85011b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ test.py
 *.pth
 *.ckpt
 *.safetensors
+preprocess_*
 
 # default github .gitignore follows
 
diff --git a/comfy_latent_interposer.py b/comfy_latent_interposer.py
index ecd7451..6c0d74a 100644
--- a/comfy_latent_interposer.py
+++ b/comfy_latent_interposer.py
@@ -13,6 +13,8 @@ config = {
 	"xl-to-v1": {"ch_in": 4, "ch_out": 4, "ch_mid": 64, "scale": 1.0, "blocks": 12},
 	"ca-to-v1": {"ch_in": 4, "ch_out": 4, "ch_mid": 64, "scale": 0.5, "blocks": 12},
 	"ca-to-xl": {"ch_in": 4, "ch_out": 4, "ch_mid": 64, "scale": 0.5, "blocks": 12},
+	"v3-to-v1": {"ch_in":16, "ch_out": 4, "ch_mid": 64, "scale": 1.0, "blocks": 12},
+	"v3-to-xl": {"ch_in":16, "ch_out": 4, "ch_mid": 64, "scale": 1.0, "blocks": 12},
 }
 
 class ResBlock(nn.Module):
@@ -89,8 +91,8 @@ class ComfyLatentInterposer:
 		return {
 			"required": {
 				"samples": ("LATENT", ),
-				"latent_src": (["v1", "xl", "ca"],),
-				"latent_dst": (["v1", "xl", "ca"],),
+				"latent_src": (["v1", "xl", "v3", "ca"],),
+				"latent_dst": (["v1", "xl"],),
 			}
 		}
 
@@ -144,7 +146,9 @@ class ComfyLatentInterposer:
 		lt = samples["samples"]
 		with torch.no_grad():
 			# force FP32, always run on CPU
-			lt = self.model(lt.cpu().float()).to(lt.device).to(lt.dtype)
+			lt = self.model(
+				lt.cpu().float()
+			).to(lt.device).to(lt.dtype)
 		samples["samples"] = lt
 		return (samples,)
 
diff --git a/config/v3-to-v1.yaml b/config/v3-to-v1.yaml
new file mode 100644
index 0000000..1c82812
--- /dev/null
+++ b/config/v3-to-v1.yaml
@@ -0,0 +1,40 @@
+steps: 20000
+batch:    48
+fconst:    0
+cosine: False
+resume: False
+device: "cuda"
+p_loss_weight: 1.0
+r_loss_weight: 1.4
+b_loss_weight: 1.0
+h_loss_weight: 0.0
+save_image:  100
+eval_model:   10
+
+model:
+  src: v3 # Stable Diffusion Version three point oh
+  dst: v1 # Stable Diffusion 1.x
+  rev: "v4.0-rc1"
+  args:
+    scale: 1.0
+    ch_in:  16
+    ch_out:  4
+    ch_mid: 64
+    blocks: 12
+
+optim:
+  lr: 5.0e-4
+  beta1: 0.5
+  beta2: 0.95
+
+dataset:
+  src: "./latents/v3_256px_combined.bin"
+  dst: "./latents/v1_256px_combined.bin"
+  preload: False
+  evals:
+    main:
+      src: "./latents/test_eru/test_v3_768px.npy"
+      dst: "./latents/test_eru/test_v1_768px.npy"
+    aux:
+      src: "./latents/test_bga/test_v3_768px.npy"
+      dst: "./latents/test_bga/test_v1_768px.npy"
diff --git a/config/v3-to-xl.yaml b/config/v3-to-xl.yaml
new file mode 100644
index 0000000..68ee5e7
--- /dev/null
+++ b/config/v3-to-xl.yaml
@@ -0,0 +1,40 @@
+steps: 20000
+batch:    48
+fconst:    0
+cosine: False
+resume: False
+device: "cuda"
+p_loss_weight: 1.0
+r_loss_weight: 1.4
+b_loss_weight: 1.0
+h_loss_weight: 0.0
+save_image:  100
+eval_model:   10
+
+model:
+  src: v3 # Stable Diffusion Version three point oh
+  dst: xl # Stable Diffusion Extra Large
+  rev: "v4.0-rc1"
+  args:
+    scale: 1.0
+    ch_in:  16
+    ch_out:  4
+    ch_mid: 64
+    blocks: 12
+
+optim:
+  lr: 5.0e-4
+  beta1: 0.5
+  beta2: 0.95
+
+dataset:
+  src: "./latents/v3_256px_combined.bin"
+  dst: "./latents/xl_256px_combined.bin"
+  preload: False
+  evals:
+    main:
+      src: "./latents/test_eru/test_v3_768px.npy"
+      dst: "./latents/test_eru/test_xl_768px.npy"
+    aux:
+      src: "./latents/test_bga/test_v3_768px.npy"
+      dst: "./latents/test_bga/test_xl_768px.npy"
diff --git a/utils.py b/utils.py
deleted file mode 100644
index ed550aa..0000000
--- a/utils.py
+++ /dev/null
@@ -1,123 +0,0 @@
-#
-# This file just has all the random saving/logging/eval related code
-#
-import os
-import torch
-from tqdm import tqdm
-from diffusers import AutoencoderKL
-from safetensors.torch import save_file
-from torchvision.utils import save_image
-
-LOSS_MEMORY = 500
-LOG_EVERY_N = 500
-SAVE_FOLDER = "models"
-
-class ModelWrapper:
-	def __init__(self, name, specs, model, optimizer, criterion, scheduler, device="cpu", evals=[None,None], stdout=True):
-		self.name   = name
-		self.specs  = specs
-		self.losses = []
-
-		self.model = model
-		self.optimizer = optimizer
-		self.criterion = criterion
-		self.scheduler = scheduler
-
-		self.device = device
-		self.vae    = self.get_vae(self.specs[1], fp16=True)
-		self.eval_src = evals[0]
-		self.eval_dst = evals[1]
-
-		os.makedirs(SAVE_FOLDER, exist_ok=True)
-		self.csvlog = open(f"{SAVE_FOLDER}/{self.name}.csv", "w")
-		self.stdout = stdout
-
-	def log_step(self, loss, step=None):
-		self.losses.append(loss)
-		step = step if step else len(self.losses)
-		if step % LOG_EVERY_N == 0:
-			self.log_main(step)
-
-	def log_main(self, step=None):
-		lr = float(self.scheduler.get_last_lr()[0])
-		avg = sum(self.losses[-LOSS_MEMORY:])/LOSS_MEMORY
-		evl = self.eval_model()[0]
-		if self.stdout:
-			tqdm.write(f"{str(step):<10} {avg:.4e}|{evl:.4e} @ {lr:.4e}")
-		if self.csvlog:
-			self.csvlog.write(f"{step},{avg},{evl},{lr}\n")
-			self.csvlog.flush()
-
-	def eval_model(self):
-		with torch.no_grad():
-			pred = self.model(self.eval_src.to(self.device))
-			loss = self.criterion(pred, self.eval_dst.to(self.device))
-		return loss, pred
-
-	def save_model(self, step=None, epoch=None):
-		step = step if step else len(self.losses)
-		if epoch is None and step >= 10**6:
-			epoch = f"_e{round(step/10**6,2)}M"
-		elif epoch is None:
-			epoch = f"_e{round(step/10**3)}K"
-		output_name = f"./{SAVE_FOLDER}/{self.name}{epoch}"
-		if self.vae:
-			out = self.eval_model()[1]
-			img = self.vae_decode(out).detach()
-			save_image(img, f"{output_name}.png")
-			torch.cuda.empty_cache()
-		save_file(self.model.state_dict(), f"{output_name}.safetensors")
-		torch.save(self.optimizer.state_dict(), f"{output_name}.optim.pth")
-
-	def close(self):
-		del self.vae
-		self.csvlog.close()
-
-	def vae_decode(self, latent):
-		latent = latent.to(torch.float16).to("cuda")
-		out = self.vae.decode(latent).sample
-		out = out.float().to(latent.device)
-		out = torch.clamp(out, min=-1.0, max=1.0)
-		return ((out + 1.0) / 2.0)
-
-	def get_vae(self, version, file_path=None, fp16=False):
-		"""Load VAE from file or default hf repo. fp16 only works from hf"""
-		vae = None
-		dtype = torch.float16 if fp16 else torch.float32
-		if version == "v1" and file_path:
-			vae = AutoencoderKL.from_single_file(
-				file_path,
-				image_size=512,
-			)
-		elif version == "v1":
-			vae = AutoencoderKL.from_pretrained(
-				"runwayml/stable-diffusion-v1-5",
-				subfolder="vae",
-				torch_dtype=dtype,
-			)
-		elif version == "xl" and file_path:
-			vae = AutoencoderKL.from_single_file(
-				file_path,
-				image_size=1024
-			)
-		elif version == "xl" and fp16:
-			vae = AutoencoderKL.from_pretrained(
-				"madebyollin/sdxl-vae-fp16-fix",
-				torch_dtype=torch.float16,
-			)
-		elif version == "xl":
-			vae = AutoencoderKL.from_pretrained(
-				"stabilityai/stable-diffusion-xl-base-1.0",
-				subfolder="vae"
-			)
-		else:
-			raise NotImplementedError(f"Unknown VAE version '{version}'")
-
-		# save VRAM
-		vae.to(dtype).to("cuda")
-		vae.decoder.eval()
-		vae.set_use_memory_efficient_attention_xformers(True)
-		vae.enable_xformers_memory_efficient_attention()
-		vae.enable_gradient_checkpointing()
-		del vae.encoder
-		return vae
diff --git a/vae.py b/vae.py
index e4fa097..713ffa9 100644
--- a/vae.py
+++ b/vae.py
@@ -48,6 +48,20 @@ class SDXL_VAE(SDv1_VAE):
 		if dec_only:
 			del self.model.encoder
 
+class SDv3_VAE(SDv1_VAE):
+	scale = 1/8
+	channels = 16
+	def __init__(self, device=DEVICE, dtype=DTYPE, dec_only=False):
+		self.device = device
+		self.dtype = dtype
+		self.model = AutoencoderKL.from_pretrained(
+			"stabilityai/stable-diffusion-3-medium-diffusers",
+			subfolder="vae"
+		)
+		self.model.eval().to(self.dtype).to(self.device)
+		if dec_only:
+			del self.model.encoder
+
 class CascadeC_VAE(SDv1_VAE):
 	scale = 1/32
 	channels = 16
@@ -75,7 +89,7 @@ class CascadeA_VAE():
 	def __init__(self, device=DEVICE, dtype=DTYPE, dec_only=False):
 		self.device = device
 		self.dtype = dtype
-		
+
 		# not sure if this will change in the future?
 		from diffusers.pipelines.wuerstchen.modeling_paella_vq_model import PaellaVQModel
 		self.model = PaellaVQModel.from_pretrained(
@@ -102,13 +116,28 @@ class CascadeA_VAE():
 			out = torch.clamp(out, min=0.0, max=1.0)
 		return out.to(latent.dtype).to(latent.device)
 
+class No_VAE():
+	scale = 1
+	channels = 3
+	def __init__(self, *args, **kwargs):
+		pass
+
+	def encode(self, image):
+		return image
+
+	def decode(self, image):
+		return image
+
+vae_vers = {
+	"no": No_VAE,
+	"v1": SDv1_VAE,
+	"xl": SDXL_VAE,
+	"v3": SDv3_VAE,
+	"cc": CascadeC_VAE,
+	"ca": CascadeA_VAE,
+}
+
 def load_vae(ver, *args, **kwargs):
-	if ver == "v1":
-		VAE = SDv1_VAE
-	elif ver == "xl":
-		VAE = SDXL_VAE
-	elif ver == "cc":
-		VAE = CascadeC_VAE
-	elif ver == "ca":
-		VAE = CascadeA_VAE
-	return VAE(*args, **kwargs)
+	assert ver in vae_vers.keys(), f"Unknown VAE '{ver}'"
+	vae_class = vae_vers[ver]
+	return vae_class(*args, **kwargs)